PROC SGPANEL binwidth/binstart not applying

[bemiller]

Hi Everyone,

I am trying to create some basic histograms using proc sgpanel and I am having trouble with the binwidth and binstart options. On some of the graphs I create, one panel will not follow the width and starting point specified. For example, I have four panels on a graph, three of which start at the point identified (1.25) with binstart and have the appropriate width (2.5), but the last one has widths twice as big (5) and starts at a different point (0). 

Code:

proc sgpanel data = subjectlevel;
	panelby class;
	histogram score/ binwidth = 2.5 binstart = 1.25;
	colaxis values = (0 to 50 by 5);
run;	

Is there any way to fix this problem?

Thanks!

[ballardw]

You might look at the actual values of your score variable for the fourth value of the panelby variable.

I suspect some combination of values and intervals between values of the score variable are causing a problem.

[bemiller]

For all of the groups, the scores are whole numbers, and the fourth group specifically has 10% of the data from 0-2 (so where the first bin should be).

[bemiller · Accepted solution]

I fixed it by adding 0.0001 to my binwidth. so my code went from

proc sgpanel data = subjectlevel;
 panelby class;
 histogram score/ binwidth = 2.5 binstart = 1.25;
 colaxis values = (0 to 50 by 5);
run;

to 

proc sgpanel data = subjectlevel;
 panelby class;
 histogram score/ binwidth = 2.5001 binstart = 1.25;
 colaxis values = (0 to 50 by 5);
run;

...